Currently Being ModeratedSep 12, 2012 4:25 AM (in response to AshleyTrease)
I am encoutering this as well. More specifically, this is happening with an event with the following attributes:
1. It was create by someone else via an .ics document.
2. The error is happening on a modification to the original.
3. It is a repeating event.
HTTP Error Logging
I enabled HTTP Error Logging for the Calendar.app (as suggested in this forum post https://discussions.apple.com/message/19528459#19528459 ) and it reveals a little more detail:
9/12/12 6:01:39.987 AM CalendarAgent: [com.apple.calendar.store.log.caldav.queue] [Operation [<CalDAVWriteEntityQueueableOperation: 0x7fb87e35d6a0; Sequence: 212>] was forbidden, server reason: [[<CoreDAVErrorItem: 0x7fb87e764990>]: DAV:error]
<?xml version="1.0" encoding="UTF-8"?>
Error on iCloud.com Web App
I get an error message when I try to modify the same calendar event using the iCloud.com Web App.
Error message: Couldn't delete null. This error couldn't be deleted because of a server error. Please try again.
Error report: I have copied the iCloud.com error report, but did not paste it here becuase it may contain private information.MacBook Air, OS X Mountain Lion (10.8.1)
Currently Being ModeratedSep 21, 2012 2:40 PM (in response to AshleyTrease)
I'm having a similar issue, but it's only occurring with a single entry that I'm trying to create from a .ics file that originated in Lotus Notes. The .ics file has been recreated and sent to me multiple times and the result is always the same. If I create the entry manually, however, and supply exactly the same values for all entries there's no problem.This leads me to believe that the content of the file is malformed and that's the source of the problem. This may or may not be applicable to your situation, but trying to recreate the calendar entry may be worth trying.
Currently Being ModeratedOct 21, 2012 2:07 AM (in response to AshleyTrease)
I am running OS X 10.7.5; I joined a webinar last night and am getting the same error message, just about:
Access to "(the webinar I joined)” in “(the calendar I chose” in account “(my apple id)” is not permitted.
The server responded:
to operation CalDAVWriteEntityQueueableOperation.
My options are: Go Offline or Revert to Server
This is a recurring entry using a downloaded .ics. Have downloaded it several times with the same result, does not matter which calendar I put it in. It does put in the first session, puts the second one in the wrong date, puts in no more. I have entered it manually which gets it in there but the error message keeps coming up. I also imported it from the .ics file I downloaded, rather than using the online method from the website, and then from the email, where the webinar originates.
This is happening on a late 2008 MBP as well as a mid 2011 iMac.
Not Mountain Lion.
Currently Being ModeratedNov 3, 2012 10:07 AM (in response to AshleyTrease)
Don't know if this has been resolved. It's not strictly a Mountain Lion issue because I've started running into it, but haven't yet upgraded.
I googled "validate .ics files" since they seem to be the common cause and found a validator at
When I checked the .ics file that was giving me fits, it told me "Your calendar is using an invalid newline format. Make sure to use
\r\nto end lines rather than just
\n(RFC 2445 §4.1)."
But it also told me "Congratulations; your calendar validated!"
So who knows? The invalid newline format thing may be causeing problems, but I don't know what to do with that information yet.
Currently Being ModeratedNov 22, 2012 2:52 PM (in response to AshleyTrease)
This worked for me:
Back up calendars. Disable calendars, open finder and move the following folders from ~/Library/ to your desktop.
If you find other iCal / Calendar referring files, move them also (these were the ones I found): Keep a track of where they came from in case you need to put them back. Then reenable iCloud Calendars in preferences and reenter account info in Calendars if it's missing. Everything is working as it should now.
Stackexchange thread where I found the tip.
Currently Being ModeratedJan 9, 2013 12:43 PM (in response to apptastic)
That pretty much worked for me too, except that I had to use my backup ( which I took earlier ;- ) to replace all the calender events, checked with adding and removing an event and seeing the change in icloud.
Currently Being ModeratedAug 19, 2013 1:33 AM (in response to AshleyTrease)
I know it is an old thread, but I just disable the account, close ical, reopened, enabled the account. It worked perfectly well.
Currently Being ModeratedAug 30, 2013 11:08 AM (in response to lawapple)
I was able to get relief by changing my Mac calendar preferences in the Account settings to refresh my calendar every 15 minutes. I also changed my iPhone settings in Mail, Contacts, Calendars in Fetch New Data to Push and to Fetch Hourly.
Currently Being ModeratedSep 6, 2013 6:23 AM (in response to griffdb)
This worked for me too: "I just disable the account, close ical, reopened, enabled the account."
Currently Being ModeratedSep 6, 2013 6:22 AM (in response to lawapple)
RE: I just disable the account, close ical, reopened, enabled the account. It worked perfectly well.
Thank you! This worked for me too. Very easy! Whew. That was a nitemare
However, my cloud calendar is still NOT pushing two subscriptions to my computer. Any ideas why?
Currently Being ModeratedNov 17, 2013 6:58 AM (in response to AshleyTrease)
What did I do? Many tries, finally start all over. For me it worked.
Backup: total Calendar, but more important: from each Calendar I have, one by one.
Delete preferences: all Calendar-files from the Library
(see post from someone else: • /Calendars
If you find other iCal / Calendar referring files, move them also (these were the ones I found): Keep a track of where they came from in case you need to put them back.
Empty my iCal for 100%
Log out from iCloud (first back up again, addresses, etc.)!!!
I opened all Calenders with a text editor, and deleted items containing the word Error.
Each item starts wit Begin:Vevent and ends with End:Vevent. Save the Calendars.
Then I started from the beginning: I opened iCal, I started iCloud again (some information was still there, so I deleted it), I tried to synchronise: and it worked (synchronising two empty databases, with only one Calendar which I named Calendar, yes)
Then one by one, I added new Calendars to iCal, empty ones, immediately checking if they showed up in www.icloud.com. And they did. Then I imported the backup-file is this empty calendar, first the calendar smallest in size. And so one by one I have built it up again, each time making a back-up from iCal, just to be sure.
So far it works fine. So communication between Imac and iCloud works. Now I am a bit anxious what will happen with my iPhone and iBook…. I will try iBook first, deleting preferences, emptying all I can, and then logging in at iCloud: and yes, it works!!
Ridiculous that this takes so much effort. I have always been an Apple fan for the last 10 years, but now I am not so sure anymore, this all looks like the standard windows-complications, though I have heard that they are getting better all the time.
Please do something, Apple!
Currently Being ModeratedDec 11, 2013 3:58 AM (in response to AshleyTrease)
Just delete the appointment and write it all over again.
It worked for me and synced directly to my phone after i deleted the appointment.
This way you don't have to do crazy stuff to get your ical appointment in the program.